Rayleigh scattering anisotropic

Bauer DR, Alms GR, Braumann JI, Pecor R. Depolarized Rayleigh scattering and 13C NMR studies of anisotropic molecular reorientation of aromatic compounds in solution. J Chem Phys 1974 61 2255-2261. 

H. D. Dardy, V. Volterra, and T. A. Litovitz. Rayleigh scattering Orientational motion in highly anisotropic liquids. J. Chem. Phys., 59 4491-4500 (1973). 

M. Perrot, M. Besnard, J. Lascombe, and M. Bouachir. Orientational and induced depolarized Rayleigh scattering of some anisotropic molecules in their liquid state. Canad. J. Phys., 59 1481-1486 (1981). 

In recent years, experimental investigation of the depolarized Rayleigh scattering of several liquids composed of optically anisotropic molecules has confirmed the existence of a doublet-symmetric about zero frequency change and with a splitting of approximately 0.5 GHz (see Fig. 12.1.1). The existence of this doublet had been predicted on the basis of a hydrodynamic theory several years previously by Leontovich (1941). This theory assumes that local strains set up by a transverse shear wave are relieved by collective reorientation of individual molecules. Later, Rytov (1957) formulated a more general hydrodynamic theory for viscoelastic fluids that reduces to the Leontovich theory in the appropriate limit. The theories of Rytov and Leontovitch are different from the present two-variable theory, in that the primary variable is the stress tensor and not the polarizability. 

The cancellation effects are not so pronounced in fluids of molecules with anisotropic shapes (ie lower than tetrahedral symmetry). Let us consider the induced Rayleigh scattering in a liquid of linear, centrosymmetric molecules( ). Then the polariz-... 

The anisotropic interactions cited above are of broader importance. According to theory, they depend directly on the square of the anisotropy Aa of the polarizability of the particle relative to its mean polarizability a. The anisotropy Aa can be evaluated from depolarized Rayleigh scattering combined with other measurements of optical anisotropy the mean polarizability a can be deduced from the refractive index. The magnitude of the orientation-dependent interaction can be expressed by a characteristic temperature 7 that denotes the magnitude of the interaction for perfect orientation. ... 

We have discussed intrinsically anisotropic particles—ones with anisotropy originating in their optical constants rather than their shape—in previous chapters. In Section 5.6 we gave the solution to the problem of scattering by an anisotropic sphere in the Rayleigh approximation. From the results of that section and Section 5.5 it follows that the average cross section (C) (scattering or absorption) of a collection of randomly oriented, sufficiently small, anisotropic spheres is... 

Keyes T, Kivelson D, McTague JP. Theory of k-independent depolarized Rayleigh wing scattering in liquids composed of anisotropic molecules. J Chem Phys 1971 55 4096-4100. 

T, Bancewiez. Rayleigh light scattering by liquids composed of interacting anisotropic molecules Spherical tensor approach within the second-order approximation of the DID model. Molec. Phys., 50 173-191 (1983). 

N. D. Gershon, E. Zamir, and A. Ben-Reuven. Rayleigh wing scattering from liquids of anisotropic molecules. Ber. Bunsen Ges. Phys. Chem., 75 316-319 (1971). 

B. Simic-Glavaski and D. A. Jackson, Rayleigh depolarized light scattered from isotropic and anisotropic molecular liquids. 5. Phys. (Paris), 55 C1 183-C1 189 (1972). 

Information concerning orientational correlations between anisotropic molecules in the liquid state can be obtained from measurements of the Cotton-Mouton effect and of depolarized Rayleigh light scattering. Le Fevre, Murthy, and Stiles studied C F, + CeH, using the former technique and showed that... 

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